Cell Signalling and Transduction - Medical Science

Q1:

Which of the following is a hormone whose action requires a cell surface receptor?

A Nitric oxide

B Progesterone

C Adrenaline

D Growth factors

ANS:C - Adrenaline

The growth factors, which are all proteins,have the hormone-like effects and need to receptors for their functions. So the D response is the correct one.